package com.dzx.design.principle.singleresponsibility;

/**
 * @author dzx
 * @ClassName:
 * @Description:
 * @date 2019年06月21日 17:28:34
 */
public class CourseImpl implements  ICourseManager,ICourseContent {
    public String getCourseName() {
        return null;
    }

    public byte[] getCourseVideo() {
        return new byte[0];
    }

    public void studyCourse() {

    }

    public void refundCourse() {

    }
}
